Bearing support for heater valve shaft in internal combustion engines

ABSTRACT

A bearing support for a heater-valve shaft in internal combustion engines, in which a shaft with a valve mounted thereon is arranged in an exhaust elbow or at a corresponding place, for example, in a distributor housing, which controls the inlet of the hot exhaust gases for the preheating of the suction air and/or the carburetor; the shaft is supported by means of two symmetrically arranged conical members in corresponding conical bearing portions of the exhaust elbow or of the corresponding distributor housing and at least one of the conical bearing supports is adjustable.

[22] Filed:

United States Patent 1191 link Nov. 27, 1973 BEARING SUPPORT FOR HEATERVALVE SHAFT IN INTERNAL COMBUSTION ENGINES v [75] Inventor: Anton Zink,Fellbach, Germany [73] Assignee: Daimler-Benz Aktiengesellschaft,

Stuttgart-Unterturkheim, Germany Dec. 20, 1971 21 Appl. No.: 210,022

[30] Foreign Application Priority Data Dec. 23, 1970 Germany P 20 63369.6

[52] US. Cl 251/303, 308/70, 123/122 H,

[51] Int. CI.... F16k 1/22 [58] Field of Search 308/70, 71; l23/122I'I,122 AB; 251/298-308 [56] References Cited" UNITED STATES PATENTS1,891,768 12 /1932 Kishline 123/122H 278,949 6/1883 Hartman 308/70 X333,049 12/1885 Archibald 308/70 X 2,539,037 1/1951 Shields 308/70 UX2,883,149 4/1959 Fiorentini 251/308 X 3,260,496 7/1966 Borcherdt....251/305 X 3,300,137 1/1967 Murphy 251/305 X Primary Examiner-Henry T.Klinksiek Att0rneylau1 M. Craig et al.

[ 5 7 ABSTRACT A bearing support for a heater-valve shaft in internalcombustion engines, in which a shaft with a valve mounted thereon isarranged in an exhaust elbow or at a corresponding place, for example,in a distributor housing, which controls the inlet of the hot exhaustgases for the preheating of the suction air and/or the carburetor; theshaft is supported by means of two symmetrically arranged conicalmembers in corresponding conical bearing portions of the exhaust elbowor of the corresponding distributor housing and at least one of theconical bearing supports is adjustable. 1

18 Claims, 2 Drawing Figures The present invention relates to thebearing support of a heater-valve shaft in internal combustion engineswhereby a shaft with a valve or flap mounted thereon is arranged in anexhaust elbow or at a corresponding place, for example, in a distributorhousing, which valve or flap controls the inlet of the hot exhaust gasesfor the preheating of the suction air and/or carburetor.

With known bearing supports of the aforementioned type, the heater-valveshaft is supported by means of two cylindrical bushes in thecorresponding distributor housing or the like. This bearing supportfrequently leads to objections, and more particularly, either thepredetermined clearance is excessive which has as a consequence anincreased wear and above all noises or, the clearance is too small sothat the shaft, as a result of deposits of combustion residues, jams oreven seizes. The elimination of these shortcomings requires aconsiderable expenditure in work.

The present invention is concerned with the task to avoid theaforementioned disadvantages. Consequently, by means of the presentinvention, the occurrence of noises is to be precluded and the seizingof the shaft is to be avoidedpTherebeyond, an easy readjustability anddisassembly of the entire arrangement is aimed at. This goal is solvedaccording to the present invention with the bearing supports of theaforementioned type in that the shaft is supported by means of twomutually symmetrically arranged cones in corresponding conical bearingparts of the exhaust elbow or of the corresponding distributorconnection and at least one conical bearing support is adjustable.

The present invention entails the advantage that as a result of theadjustability of one conical bearing the play can now be so adjustedthat neither any noise can occur nor the valve can seize. Therebeyondany possibly occurring wear can be easily compensated for by theadjustable construction. The relatively long repair times necessaryheretofore can thereforebe dispensed with and the assembly anddisassembly of such an arrangement is simple and can be carried outwithout great expenditures.

The present invention includes every possible adjustment of the proposedconical bearing support. Preferred, however, is a solution according towhich one of the conical parts arranged on the shaft is displaceable inthe longitudinal direction of the shaft. A springy or elasticadjustment, for example, by means of a prestressed spring for theadjustable bearing support, is thereby also within the purview of thepresent invention, by means of which an automatic clearance and wearcompensation could be achieved.

In one embodiment according to the present invention conical bearingplaces having a diameter increasing toward the outside are arranged inthe walls of the exhaust elbow or of the distributor housing or the likeand bearing parts with corresponding inclination are mounted on theshaft. A cone inclination of about 60 has proved thereby particularlyappropriate. It is thereby proposed in detail that one conical bearingpart is secured on the shaft so as to be axially nondisplaceable andabuts outwardly thereof against a collar of the shaft and that theopposite bearing part is adjustably secured on the shaft by means of ascrew engaging into a longitudinal groove of the shaft.

Heater-valve shafts are knowninthe art which are equipped with aneccentrically arranged weight rombration damping. The present inventionproposes for such an arrangement that a neck portion is formed on orsecured at the weight, which simultaneouslyforms the conicalbearingpart. It is thereby furthertproposed that the weight together with theconical bearing part is axially adjustably secured on theshaft.

It has been found thereby as further advantage that with a bearingsupport constructedaccording to the present invention, the size of sucha weight can be. considerably reduced. This is probably due to the factthat a considerable vibration damping is achieved already by the bearingsupport itself.

Accordingly, it is an object of the present invention to provide abearing support for a heater-valve shaft in an internal combustionengine which avoids by simple means the aforementioned shortcomings anddrawbacks encountered in the prior art.

Another object of the present invention resides inla bearing support ofa heater-valve shaft in internal combustion engines which is simple inconstruction and permits ready assembly and disassembly withoutextensive work.

A further object of the present invention resides in a bearing supportfor a heater-valve shaft in internal combustion engines which permitsready readjustment to avoid excessive play or seizing.

Another object of the present invention resides in a bearing support fora heater-valve shaft in internal combustion engines which eliminatesexcessive noisecin the operation thereof as well as lengthy repairtimes.

A further object of the present invention resideslin a heater-valveshaft mounting in internal combustion engines which exhibitsconsiderable damping itself These and further objects,features andadvantagesof the present invention will become more apparent from thefollowing description when taken in connection with the accompanyingdrawing which showspfor purposes of illustration only, two embodimentsinaccordance with'the present invention, and wherein:

FIG! is a cross-sectional view through a bearing support of aheater-valve shaft in accordance with the.

present invention; and

FIG. 2 is a cross-sectional view through amodified embodiment of abearing support of a heater-valve shaft with damping weight inaccordance with the present invention.

Referring now to the drawing whereinlike reference numerals are usedthroughout the twoviews todesignate like parts, and more particularlytoFIG. 1; accord ing to this figure, a heater-valve l1 mountedon ashaft12 is supported by means of two conical bearingsgenerally designated byreference numerals 13. and it 14 within a distributor housing 10 notshown.indetailwhich may be secured at the exhaust elbow of aninternalcombustion engine or may be constructed in one piece therewith. Theheater-valve-or flap 11 is secured on the shaft 12, for example, bymeansof screws. The

conical bearing support 13 is thereby fixed in the axial shaft 12 in aconventional manner; the abutment pin 16 cooperates with a pin 17arranged in the housing 10. The function and operation of such aheater-valve. is

known as such and except for the details described herein forms no partof the present invention.

For purposes of forming the conical bearing supports 13 and 14, the wallportions 18 and 19 of the distributor housing are provided with conicalsurfaces 20 and 21 which are disposed symmetrically to one another andhave a diameter increasing toward the outside. The cone inclinationthereby preferably amounts to about 60. With the non-adjustable conicalbearing support 13 a conical bearing part 22 which is secured on theshaft 12, for example, by a pressure fit, has the same conicalinclination. This bearing part 22 abuts outwardly thereof against acollar 23 of the shaft 12.

With the conical bearing support 14, a conical bearing part 24 is againarranged on the shaft 12, which, however, is axially adjustable in thatcase. For this purpose, it is provided with a screw 25 that engages inthe longitudinal slot 26 or a coresponding flatened surface at the shaft12. i The operation of the described bearing support can be readilyunderstood from the preceding description taken in conjunction withFIG. 1. The bearing support can be so adjusted in its play by means ofthe axially adjustable bearing support without great difficulties andwithout'great expenditures in work that neither a rattling nor a seizingoccurs.

According to FIG. 2-the basic construction is exactly the same as inFIG. 1. In particular the axially nonadjustable bearing support 13 isconstructed in the same manner. However, a weight 27 is now arranged ontheshaft l2, and more particularly as cannot be seen in the drawing isarranged eccentrically. This weight 27 serves for the damping of anypossible flutter movements of the shaft 12 and of the flap or valve 11.A neck portion 28 is formed on the weight 27 which constitutes at thesame time at the end thereof the conical bearing surface 29 for-theaxially adjustable conical bearing support 14. The adjustment of thisbearing support takes place again by the screw 25 engaging into thelongitudinal slot 26 of the shaft 12. With such an adjustment the weight27 inclusive the neck portion 28 is therefore adjusted. The operationofthis arrangement is exactly the same as described by reference to FlG.l. i 1

While I have shown and described only two embodiments in accordance withthe present invention, it is understood that the same is not limitedthereto but is susceptible of numerous changes and modifications asknown to those skilled in the art and I, therefore, do not wish to belimited to the details shown and described herein but intend to coverall such changes and modifications as are encompassed by the scope ofthe appended claims.

What I claim is:

l. A bearing support of a valve shaft in an internal combustion enginein which a shaft with a valve mounted thereon is arranged in arelatively fixed part and controls the inlet of hot gases and a weightsecured on the shaft serving as vibration damping means, characterizedin that the shaft is supported in the relatively fixed part by means oftwo mutually substantially symmetrically arranged conical bearingsupport means including two symmetrically arranged conical bearingmembers engaging in corresponding conical bearing portions having adiameter increasing toward the outside of the housing provided in wallsof the relatively fixed part, and in that at least one of the conicalbearing members is displaceable in the longitudinal direction of theshaft, and is adjustably secured on the shaft by means of a screwengaging in a longitudinal groove of the shaft, and in that the otherbearing member is axially non-displaceably secured on the shaft andabuts externally thereof against a collar of the shaft, and in that theweight includes a neck portion which simultaneously forms one conicalbearing member.

2. A bearing support according to claim 1, characterized in that therelatively fixed part is a distributor housing.

3. A bearing support according to claim 2, characterized in that thedistributor housing is arranged in a part of the exhaust gas system ofan internal combustion engine and in that the valve controls the inletof the hot exhaust gases for preheating suction air and/or carburetormeans.

4. A bearing support according to claim 1, characterized in that therelatively fixed part forms part of the exhaust gas system of theinternal combustion engine.

5. A bearing support according to claim 4, characterized in that saidrelatively fixed part is an exhaust elbow.

6. A hearing support according to claim 1, characterized in that theneck portion is rigid with theweight.

7. A bearing support according to claim 1, characterized in that theneck portion is made in one piece with the weight. g

8. A bearing support according to claim 1, characterized in that theweight together with its bearing member is axially adjustably secured onthe shaft.

9. A bearing support for a valve shaft in an internal combustion engineto control the inlet of hot gases comprising: a means for housing atleast a portion of the valve shaft, at least a pair of mutuallysubstantially symetrically arranged conical support means disposed insaid housing for supporting the valve shaft; at least a pair ofsymmetrically arranged conical bearing means engageable with acorresponding conical support means for rotatably supporting the valveshaft, at least one of said conical bearing means being adjustablerelative to the valve shaft, and a damping means provided on at leastone of said bearing means for vibration damping of the valve shaft.

10. A bearing support according to claim 9, wherein the adjustableconical bearing means is displaceable in the longitudinal direction ofthe valve shaft.

11. A bearing support according to claim 10, wherein said conicalsupport means are provided with a diameter increasing toward the outsideof said housing and are disposed in walls of said housing and saidconical bearing means with a substantially corresponding inclination aremounted on the valve shaft.

12. A bearing support according to claim 11, wherein the other bearingmeans is axially non-displaceably secured on the valve shaft oppositethe adjustable conical bearing means and abuts externally thereofagainst a collar of the valve shaft is adjustable secured on the valveshaft by means of a screw engaging in a longitudinal groove of the valveshaft.

13. A bearing support according to claim 9 wherein said conical supportmeans are provided with a diameter increasing toward the outside of saidhousing and are disposed in walls of said housing and said conicalbearing means with a substantially corresponding inclination are mountedon the valve shaft.

ing member.

16. A bearing support according to claim 15, wherein said neck portionis rigid with the weight.

17. A hearing support according to claim 15, wherein said neck portionis made in one piece with the weight.

18. A bearing support according to claim 15, wherein said weighttogether with its conical bearing means is axially adjustably secured onthe shaft.

1. A bearing support of a valve shaft in an internal combustion enginein which a shaft with a valve mounted thereon is arranged in arelatively fixed part and controls the inlet of hot gases and a weightsecured on the shaft serving as vibration damping means, characterizedin that the shaft is supported in the relatively fixed part by means oftwo mutually substantially symmetrically arranged conical bearingsupport means including two symmetrically arranged conical bearingmembers engaging in corresponding conical bearing portions having adiameter increasing toward the outside of the housing provided in wallsof the relatively fixed part, and in that at least one of the conicalbearing members is displaceable in the longitudinal direction of theshaft, and is adjustably secured on the shaft by means of a screwengaging in a longitudinal groove of the shaft, and in that the otherbearing member is axially non-displaceably secured on the shaft andabuts externally thereof against a collar of the shaft, and in that theweight includes a neck portion which simultaneously forms one conicalbearing member.
 2. A bearing support according to claim 1, characterizedin that the relativeLy fixed part is a distributor housing.
 3. A bearingsupport according to claim 2, characterized in that the distributorhousing is arranged in a part of the exhaust gas system of an internalcombustion engine and in that the valve controls the inlet of the hotexhaust gases for preheating suction air and/or carburetor means.
 4. Abearing support according to claim 1, characterized in that therelatively fixed part forms part of the exhaust gas system of theinternal combustion engine.
 5. A bearing support according to claim 4,characterized in that said relatively fixed part is an exhaust elbow. 6.A bearing support according to claim 1, characterized in that the neckportion is rigid with the weight.
 7. A bearing support according toclaim 1, characterized in that the neck portion is made in one piecewith the weight.
 8. A bearing support according to claim 1,characterized in that the weight together with its bearing member isaxially adjustably secured on the shaft.
 9. A bearing support for avalve shaft in an internal combustion engine to control the inlet of hotgases comprising: a means for housing at least a portion of the valveshaft, at least a pair of mutually substantially symetrically arrangedconical support means disposed in said housing for supporting the valveshaft; at least a pair of symmetrically arranged conical bearing meansengageable with a corresponding conical support means for rotatablysupporting the valve shaft, at least one of said conical bearing meansbeing adjustable relative to the valve shaft, and a damping meansprovided on at least one of said bearing means for vibration damping ofthe valve shaft.
 10. A bearing support according to claim 9, wherein theadjustable conical bearing means is displaceable in the longitudinaldirection of the valve shaft.
 11. A bearing support according to claim10, wherein said conical support means are provided with a diameterincreasing toward the outside of said housing and are disposed in wallsof said housing and said conical bearing means with a substantiallycorresponding inclination are mounted on the valve shaft.
 12. A bearingsupport according to claim 11, wherein the other bearing means isaxially non-displaceably secured on the valve shaft opposite theadjustable conical bearing means and abuts externally thereof against acollar of the valve shaft is adjustable secured on the valve shaft bymeans of a screw engaging in a longitudinal groove of the valve shaft.13. A bearing support according to claim 9 wherein said conical supportmeans are provided with a diameter increasing toward the outside of saidhousing and are disposed in walls of said housing and said conicalbearing means with a substantially corresponding inclination are mountedon the valve shaft.
 14. A bearing support according to claim 9, whereinthe other bearing means is axially non-displaceably secured on the valveshaft opposite the adjustable conical bearing means and abuts externallythereof against a collar of the valve shaft is adjustable secured on thevalve shaft by means of a screw engaging in a longitudinal groove of thevalve shaft.
 15. A bearing support according to claim 9, wherein saiddamping means includes a weight having a neck portion whichsimultaneously forms one conical bearing member.
 16. A bearing supportaccording to claim 15, wherein said neck portion is rigid with theweight.
 17. A bearing support according to claim 15, wherein said neckportion is made in one piece with the weight.
 18. A bearing supportaccording to claim 15, wherein said weight together with its conicalbearing means is axially adjustably secured on the shaft.